ARCHIVED REPORTS XR0010226 - Laserfiche WebLink

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------------------- Former Discovery Chevrolet June 5, 1998 Tracy,California Corrective Action Plan Any residual dissolved gasoline hydrocarbons present in the groundwater will likely undergo biodegredation. Groundwater systems generally have a diverse population of native microorganisms, some of which are predisposed to consuming hydrocarbon compounds. If the native microorganisms have a food source of petroleum hydrocarbons, the species of microorganisms best adapted to use the hydrocarbon food source will multiply to a population that can be supported by the food source. The remedial system at this site will effectively consist of the existing natural microorganisms present in the subsurface groundwater system. If after two quarters of groundwater sampling to verify the effectiveness of the remedial work, decreasing concentrations of petroleum hydrocarbons are detected in the groundwater beneath the site, it is Horizon's opinion that the site would qualify as a low-risk site and should be granted closure and the monitoring wells destroyed. 1-3 j .ff 7.0 DISTRIBUTION A copy of this report should be forwarded to: Mr. Jeffrey Wong 1 Ms. Margaret Lagorio Mr. Pat Anderson San Joaquin County Public Health Services, Regional Water Quality Control Board Environmental Health Division Central Valley Region 304 E. Weber Avenue, 3rd. Floor 3443 Routier Road Stockton, CA 95202 Sacramento, CA 95827-3098 8.0 LIMITATIONS This report was prepared in accordance with the methods and procedures the attached field methods and generally accepted standards of environmental geological practice in California at the time of the investigation. The investigation was conducted solely for the purpose of evaluating environmental conditions of the soil and groundwater with respect to gasoline 3001-21.cap 20 HORIZON ENVIRONMENTAL INC.